title: Reversible electrical reduction and oxidation of graphene oxide.
abstract: We demonstrate that graphene oxide can be reversibly reduced and oxidized using electrical stimulus. Controlled reduction and oxidation in two-terminal devices containing multilayer graphene oxide films are shown to result in switching between partially reduced graphene oxide and graphene, a process which modifies the electronic and optical properties. High-resolution tunneling current and electrostatic force imaging reveal that graphene oxide islands are formed on multilayer graphene, turning graphene into a self-assembled heterostructure random nanomesh. Charge storage and resistive switching behavior is observed in two-terminal devices made of multilayer graphene oxide films, correlated with electrochromic effects. Tip-induced reduction and oxidation are also demonstrated. Results are discussed in terms of thermodynamics of oxidation and reduction reactions.
authors.affiliation: UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey. ekiz@bilkent.edu.tr
authors.forename: Okan Oner
authors.initials: OO
authors.lastname: Ekiz
authors.forename: Mustafa
authors.initials: M
authors.lastname: Urel
authors.forename: Hasan
authors.initials: H
authors.lastname: Güner
authors.forename: Alpay Koray
authors.initials: AK
authors.lastname: Mizrak
authors.forename: Aykutlu
authors.initials: A
authors.lastname: Dâna